Gurobi 5.0.1 (linux64) logging started Tue Nov 20 14:08:06 2012

Optimize a model with 945 rows, 187 columns and 1890 nonzeros
Presolve removed 222 rows and 0 columns
Presolve time: 0.01s
Presolved: 723 rows, 187 columns, 1606 nonzeros
Variable types: 0 continuous, 187 integer (187 binary)
Found heuristic solution: objective 51.0000000

Root relaxation: objective 7.287500e+01, 420 iterations, 0.01 seconds

    Nodes    |    Current Node    |     Objective Bounds      |     Work
 Expl Unexpl |  Obj  Depth IntInf | Incumbent    BestBd   Gap | It/Node Time

     0     0   72.87500    0  170   51.00000   72.87500  42.9%     -    0s
     0     0   71.99588    0  187   51.00000   71.99588  41.2%     -    0s
     0     0   71.11348    0  187   51.00000   71.11348  39.4%     -    0s
     0     0   70.59615    0  185   51.00000   70.59615  38.4%     -    0s
     0     0   70.05046    0  186   51.00000   70.05046  37.4%     -    0s
H    0     0                      54.0000000   70.05046  29.7%     -    0s
     0     0   69.75183    0  182   54.00000   69.75183  29.2%     -    0s
     0     0   69.67188    0  182   54.00000   69.67188  29.0%     -    0s
     0     0   69.40679    0  184   54.00000   69.40679  28.5%     -    0s
     0     0   69.31147    0  185   54.00000   69.31147  28.4%     -    0s
     0     0   69.15666    0  184   54.00000   69.15666  28.1%     -    0s
     0     0   69.04931    0  185   54.00000   69.04931  27.9%     -    0s
     0     0   68.95777    0  187   54.00000   68.95777  27.7%     -    0s
     0     0   68.77199    0  187   54.00000   68.77199  27.4%     -    0s
     0     0   68.69218    0  186   54.00000   68.69218  27.2%     -    0s
     0     0   68.54429    0  186   54.00000   68.54429  26.9%     -    0s
     0     0   68.40316    0  186   54.00000   68.40316  26.7%     -    0s
     0     0   68.35752    0  187   54.00000   68.35752  26.6%     -    0s
     0     0   68.30528    0  186   54.00000   68.30528  26.5%     -    0s
     0     0   68.27563    0  186   54.00000   68.27563  26.4%     -    0s
     0     0   68.27563    0  186   54.00000   68.27563  26.4%     -    0s
     0     2   68.27493    0  186   54.00000   68.27493  26.4%     -    0s
H   21    21                      56.0000000   68.26864  21.9%  69.1    0s
*   78    44              17      57.0000000   67.85101  19.0%  49.9    0s
   614   311   65.76659   15  185   57.00000   65.76659  15.4%  52.1    5s
H 1392   427                      59.0000000   65.34002  10.7%  54.8    7s
  2182   683   63.97101   31  153   59.00000   64.33333  9.04%  49.7   10s
  4424  1157   62.00000   27  129   59.00000   63.00000  6.78%  43.6   15s
  7034   917     cutoff   31        59.00000   61.59459  4.40%  40.5   20s

Cutting planes:
  Gomory: 8
  Clique: 1
  Zero half: 75

Explored 8622 nodes (331985 simplex iterations) in 22.44 seconds
Thread count was 1 (of 16 available processors)

Optimal solution found (tolerance 1.00e-04)
Best objective 5.900000000000e+01, best bound 5.900000000000e+01, gap 0.0%